Amy Yang sealed her first LPGA title on home soil by overcoming Seo Hee-Kyung in a play-off at the KEB HanaBank Championship on Sunday.

The 24-year-old, who joined the Tour in 2009, managed to keep her cool and clinch her maiden victory with a birdie on the first play-off hole after a number of near misses at previous tournaments.

The South Korean headed into the decider after both her and compatriot Seo carded nine under overall at the end of the third and final round, but it was Yang who managed to get over the line despite starting the day behind.

She began the final round trailing co-leaders Katherine Hull-Kirk and Anna Nordqvist by one stroke, but kept pace before an eagle at the 15th and a birdie on the 18th meant she finished on three under for the day and entered a play-off against Seo, who also posted an eagle during her round on Sunday.

Yang did not have the best start to the first deciding hole, finding deep rough right of the fairway from the tee, before chipping skillfully out to remain in contention on the par-five 18th.

She then set herself up for a good putt, and after Seo's birdie attempt rolled just past the left of the cup, Yang stepped up to earn her first LPGA tour win, much to her delight.

"I have been waiting for this championship for a long time, and I'm really happy get it in my home country," she said.

"I think still I can't believe it."

Michelle Wie, Kim Sei-Young and Suzann Pettersen all finished tied for third on eight under.